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List:       kde-multimedia
Subject:    Re: Vote for a MM system (Was: Re: summary of the aKademy meetings)
From:       Marco Lohse <mlohse () cs ! uni-sb ! de>
Date:       2004-09-12 7:50:30
Message-ID: 4143FFC6.2060704 () cs ! uni-sb ! de
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Lennart Poettering wrote:

>On Fri, 10.09.04 17:15, Marco Lohse (mlohse@cs.uni-sb.de) wrote:
>
>  
>
>>>      
>>>
>>... at least for NMM, this problem (inter-stream synchronization of 
>>audio/video) is solved (with the help of NTP): 
>>http://graphics.cs.uni-sb.de/NMM/News/Events/CeBIT2004/index.html
>>    
>>
>
>How do you assure to have a common time source?
>
As basis, we use NTP, the network time protocol.

>
>I can add something like this to polypaudio as well. 
>  
>
Having some sort of global time is just a starting point for 
inter-stream synchronization. And using NTP, this is rather easy to achieve.

However, for doing distributed synchronization, there a lot of other 
issues that have to be resolved: different paths in your multimedia data 
flow graph have different and varying latencies, different output 
devices have different latencies, ..., finally, you also need a way to 
'speak' with distributed parts of your application.

If you are interested in how distributed synchronization is realized 
within NMM, feel free to take a look at our documentation: 
http://graphics.cs.uni-sb.de/NMM/Docs/index.html

Have fun, Marco.

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